As of the 2010 census, Bryn Athyn was 92.5% White, 2.7% Black or African American, 2.5% Asian, 0.1% Native Hawaiian, and 1.8% were two or more races. 1.2% of the population were of Hispanic or Latino ancestry [1].

There were 377 households, out of which 41.4% had children under the age of 18 living with them, 71.4% were married couples living together, 4.8% had a female householder with no husband present, and 22.5% were non-families. 19.4% of all households were made up of individuals, and 12.2% had someone living alone who was 65 years of age or older. The average household size was 3.21 and the average family size was 3.76.

In the borough the population was spread out, with 30.2% under the age of 18, 13.8% from 18 to 24, 22.4% from 25 to 44, 16.7% from 45 to 64, and 17.0% who were 65 years of age or older. The median age was 33 years. For every 100 females there were 94.9 males. For every 100 females age 18 and over, there were 89.0 males.

The median income for a household in the borough was $68,646, and the median income for a family was $76,214. Males had a median income of $48,958 versus $35,000 for females. The per capita income for the borough was $32,737. About 2.4% of families and 3.6% of the population were below the poverty line, including 2.2% of those under age 18 and 4.9% of those age 65 or over.

Cairnwood Estate was built as a family home for the industrialist John Pitcairn[10] and his wife Gertrude. The building was designed by renowned architectural firm Carrère and Hastings, and the surrounding grounds were designed by Charles Eliot of the landscape design firm Olmsted, Olmsted and Eliot. The building was eventually donated to the Academy of the New Church, and now serves as a special events facility.

Glencairn was originally the private residence of millionaire philanthropist Raymond Pitcairn. The castle-like building now serves the Academy of the New Church and Bryn Athyn College as Glencairn Museum, housing a collection of mostly religious artwork and artifacts from around the world and is open to the public.

Cairncrest was built as a home for John Pitcairn's son, Harold Pitcairn, an aviation pioneer and developer of the autogyro. The building now serves as the central administrative offices for the General Church of the New Jerusalem.

Bryn Athyn had commuter train service until January 14, 1983. Service was suspended due to failing train equipment resulting in a lack of ridership. As of 2017, the train station is used as the Bryn Athyn post office.

Though rail service was initially replaced with a Fox Chase-Newtown shuttle bus, patronage remained light. The replacement bus service was far slower and less convenient than the train service it replaced, resulting in the shuttle bus being very unpopular. The travelling public never saw a bus service as a suitable replacement for a rail service.

In the ensuing years, there has been interest in resuming passenger service by Bucks County officials. Neighboring Montgomery County officials are supportive of re-thinking the rail corridor as well, though the belief within SEPTA management is that the section through Lorimer Park and Walnut Hill Station (the only sparsely populated section along the railway) will never generate enough riders to be feasible.

In September 2009, the Southampton-based Pennsylvania Transit Expansion Coalition (PA-TEC) began discussions with township officials along the railway, as well as SEPTA officials, about the realistic possibility of resuming even minimal passenger service to relieve traffic congestion in the region. Plans call for completing the electrification to Newtown, as originally planned in the late 1970s. Both Bucks and Montgomery County officials, as well as state representatives, have been receptive to PA-TEC's efforts, despite SEPTA's overall reservations. However, SEPTA has also confirmed that they are indeed open to revisiting the line if there is strong political support in both counties.[13]

All plans for resuming the train service were dropped in 2014 when Montgomery County officials decided to extend the Pennypack Trail over the derelict rail bed.[14]

In Bryn Athyn's railroad history, a devastating accident took place on December 5, 1921. Two Reading Railroad passenger steam trains collided head-on on a blind curve. The impact sent red-hot coals flying forward from each engine, raining down on the wooden passenger cars of the oncoming train. Twenty-seven people were killed and some 70 injured. Most of those killed had burned to death, due in part to the fact that the wooden cars had burned so quickly and the inability of rescue workers to access the trains, given that they were wedged between the rock walls of the cut through hilly and wooded terrain without road access for fire equipment. The incident led to a ban on the use of wooden rail cars in order to prevent future disasters of a similar nature.

The Bryn Athyn borough is within the Bryn Athyn School District, which does not operate any public schools. 90% of school age children attend private schools within the district and the remainder are homeschooled or attend schools in neighboring districts.